because your thermostat is opening and closing as the engine temp. fluctuates
Could be low on coolant or a sticky thermostat.
Head gaskets!!
Either bad ground on your gauge or your electric cooling fans are going bad.
A short in the turn signal wiring can cause the voltage gauge to fluctuate. A loose ground wire can also cause the gauge to fluctuate.
If you drive the car 10 miles, and it doesn't move.
why doesn't my rpm gauge and temp gauge, fuel gauge not work
body temp and the my mood
is the coolant disapeering at all ?
An automobile temperature gauge can fluctuate when the thermostat is opening and closing erratically. The temperature gauge can also fluctuate when the ground wire is loose.
temp gauge is stuck on hot
1996 prelude temperature gauge reads low temp
only 3 reasons a temp gauge wont work the temp sender is bad the gauge is bad or the wire from temp sender to gauge is broken